A:
Positive:
1 x 386597913 x 29738331 x 12470953 x 72943181 x 21359403 x 9593689 x 56111643 x 2353
Negative:
-1 x -3865979-13 x -297383-31 x -124709-53 x -72943-181 x -21359-403 x -9593-689 x -5611-1643 x -2353
Unfortunately, there's not simple formula to identifying all of the factors of a number and it can be a tedious process when trying to identify the divisors of larger numbers. To find the factor combinations of the number 3,865,979, it is easier to work with a table - it's called factoring from the outside in.
We start by creating a table and writing 1 on the left side and then the number we're trying to find the factors for on the right side in a table. Then, below that, write the numbers as a negative as well.
| 1 | 3,865,979 | |
| -1 | -3,865,979 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 3,865,979.
Example:
1 x 3,865,979 = 3,865,979
and
-1 x -3,865,979 = 3,865,979
Notice both answers equal 3,865,979
With that explanation out of the way, let's continue. Next, we take the number 3,865,979 and divide it by 2:
3,865,979 ÷ 2 = 1,932,989.5
If the quotient is a whole number, then 2 and 1,932,989.5 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 3,865,979 | |
| -1 | -3,865,979 |
Now, we try dividing 3,865,979 by 3:
3,865,979 ÷ 3 = 1,288,659.6667
If the quotient is a whole number, then 3 and 1,288,659.6667 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 3,865,979 | |
| -1 | -3,865,979 |
Let's try dividing by 4:
3,865,979 ÷ 4 = 966,494.75
If the quotient is a whole number, then 4 and 966,494.75 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 3,865,979 | |
| -1 | 3,865,979 |
If you did it right, you will end up with this table:
| 1 | 13 | 31 | 53 | 181 | 403 | 689 | 1,643 | 2,353 | 5,611 | 9,593 | 21,359 | 72,943 | 124,709 | 297,383 | 3,865,979 |
| -1 | -13 | -31 | -53 | -181 | -403 | -689 | -1,643 | -2,353 | -5,611 | -9,593 | -21,359 | -72,943 | -124,709 | -297,383 | -3,865,979 |
Here are some more numbers to try:
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